It's simpler than that, even.
QUOTE
4. No illegal material or content, including but not limited to: piracy, hacking, cracks, breach of copyright, impersonating other members of the forum (including administrators and moderators), racism or defamation;[/quote]
That's a forum rule, and you can read the rules from any page by clicking on the 'Rules and Guidelines' link in the top navigation bar.
Like all the rules, this is strictly adhered to. It is also purposefully vague, which allows it to be very widely interpreted by the moderators. Personally, I interpret it as ANY discussion of ANY of the listed topics. The last thing we want is to end up as THE place to go for information on any of these topics. Other forums have different rules, and some things which are freely expressed on other forums may be a no-go here, and vice versa.
This does bring up one issue which has caused more than a bit of confusion lately. Replying to perceived unacceptable posts can lead to escalating arguments (also against the rules:), but can also lead to very messy threads, after some posts have been removed or amended by a moderator. If anyone thinks that a post is in need of moderation, it is always best to contact a forum moderator or administrator. Most posts which break the rules will be moderated, but this can take time -- normally by the time I catch on to something which needs to be moderated, it can have a few replies which don't need to exist after moderation. Better to not post them in the first place.
So, if anyone does think that any post breaks the rules, I'd suggest:
-- if you are in a 'friendly' semi-live discussion with another member, PM them and point out that their particular post may breach the rules. They can then edit their post. Self-moderation -- I like it.
-- Otherwise contact a moderator. As I said, you may need to wait for a moderator, but they'll get the job done eventually.